Harrow



F. G. 'BIGGERSTAF- IIAIIIIow. APPLICATION FILED Nov. 27, 1920.

' l.nvm/mf? 776% B/GGERS TAF@ -v vif F. BIGGERSTAFF,

HARROW. APPLICATION FILED NovA 27, I920.

Patented July M, 3 SHEETS-SHEET 3.

FRANK GRANVILLE BIGGERSTA-IFF, OF KANSAS CITY, MISSOURI.

HARROW.

Idebris and which is of simple anddurab'le construction, reliable inoperation-and easy and inexpensive to manufacture.

Other objects and advantages of the invention reside in certain novelfeatures of construction, combination and arrangement of parts whichwill be hereinafter more fully described and particularly pointedoutinthe appended claims, reference being had to the accompanying drawingsforming part of this specificatiomand in which: y

Figure 1 is a side elevational view, showincr the -harrow in operativeposition; n Figure 2 is a side elevational view, showing the harrowraised from the ground and in inoperative position;

Figure 3 is a plan view; p, Figure 4 is a front'elevational view; Figure5 is a detail perspective view of the runner;

Figure 6 is a partly perspective view of the curved cam lever and meansfor pivotally connecting it to the runner; and

Figure 7 is a detail 'perspective view of the standard.'

Referring to the drawings wherein for the sake of illustration is shownthe preferred embodiment of the invention, it will be seen that theinvention contemplates a harrow designated generally at 10 and embodyingcross bars 11 to which the harrow teeth 12 are secured and longitudinalstringers 13 secured to the cross bars. The harrow may be drawn by atractor or in any other suitable manner.

A runner 15 of at elongated form and having an upturned end 16terminating in a hook 17 is arranged beneath the harrow and is adaptedfor sliding contact with the ground. The runner is preferably arrangedcentrally of the harrow and preferably eX- tends for slightly more thanthe entire `Specification'of Letters Patent.

'at their upper end, as

Yangle brackets 23 and a pivot v.trolling the 4runner as will PatentedJul-y 11, 1922.

AppIicaton filed November 27, lffserial No. 426,787.

`length thereof, as clearly shown in Figure 3.

A curvedY cam lever 1S is pivoted to the runner by means of spaced anglebrackets 19 and a pivot bolt 1921 extending between the angle bracketsand through a suitable pivot opening provided in the curved cam lever.An operating lever 2O preferably in the form of a `hand lever isprovided and includes a pair of bars 21 secured together shown at 22,and

pivoted at their lower end to the runner ata point spaced from'thepivotal connection of the cam levertheretoby means of bolt 24. A-roller r25 is rotatably journaled in the' bars 21 of the operatinglever, and is arranged to engage the under flat face of the `cam lever`18. The cam lever 18 and the operating lever 20 constitute cooperablelevers for con- `more fully described. 'If desired, a controllingelement'26 such as a rope or the like may be led from the upper end ofthe operating lever tothe driver of the tractor or other meansutilizedfor pulling the harrow.

An abutment 'for 4the curved cam' lever is provided Aand consists ofrearwardly inclined spaced standards`28 secured at their base to one ofthe cross bars 11 of the harrow and having providedv therein Yverticallyspaced and horizontally alined pivot openings 29. Each pair of alinedypivot holes is adapted to receive the axle 30, of a'second justedvertically. The roller 31 is adapted to vengage the'upper flat face ofthe curved cam lever 18, that is, this roller 31 engages the side'of'thecam lever opposite `from the side of .the cam lever engaged by theroller 25.

Spring means, consisting of a retractile coil spring 32, is provided forbiasing the hand operated lever whereby it is normally in such positionthat the runner 15 controlled thereby in the position shown in F igure 1and the harrow is in operative position with respect to the ground. Thenthe handoperated lever is pulled by means of the flexible element 26,the spring is elongated and put under greater tension and ltends toreturn the hand operated lever to the position shown in Figure 1 and topermit the harrow to return to normal ground engaging position.

A draw bar 33 is connected to the harbe hereinafter row byfiexibleelements or the like 34 and to theV runner by means oi an eye 34areceiving the hook 17 at the forward lend of therun#l and spacedstandards fixed to oneV of said ner. Y l

In operation when the vharrow is being drawn along the ground the runnerV15 @also slides 'over theground and at this'time Vthe runner carriesonly its own weight and the weight of the cooperating levers;` When itis desired to render the harrow inactive Aor -to clean the harrow ofaccumulated debris, the operating lever 2O is swungin avclockwisedirection Vas-loyfexerting a pull 'upon the flexible element26. This causes the roller Q tofproceedl along vand exert a pressureagainstV Vthefcurvedcam lever 18 Vwhich having a sliding engagementwiththe f roller 31 of the abutment results in the exercise of adownward thrust upon the runner to throw the same into engagement withthe ground. This action 'effects the elevation of the harrow to abovethe ground so that theweight-or' the harrow istaken bythe runnerl andtheharrow is rendered inoperative and `the same Vis .cleaned of debris.vl

A1I claim:l l Y. .o '1L In combination, a`- harrowf including crossbars, a runner arranged beneath the harrow, a curved cani lever, meansfor pivotally. connecting said curved cam lever to said'V runner, anoperating lever includingV spaced bars and having a roller journaledbetween saidbars and engaged with one side of said cam lever, means torpivotallyl connecting said operatingflever toi said runner, spaced Astandards fixed toA one ofsaid cross lbars and having a roller mountedtherebetween and engaged with the cam lever on the opposite side fromsaid first-mentioned roller, and spring means for biasing said operatinglever. *Y w p 12. In-combination, a harro-w including cross bars, a.runner arranged beneath the harrow, a curved; cam lever,vmeansvforpivotally connecting said curved cam lever to said runner, an operatingvlever includingl spaced bars and having. a .roller journaled betweenvsaid bars and engaged withone side 'of saidcam lever, means forpivotal'ly connectingsaid operating lever to said runner,

lever pivoted to the runner, an operating lever pivoted tov-,said runnerand including spaced bars and having a roller journaled between saidbars and engaged with one side *Y of said cam lever, and anabutmentarranged upon said harrow `and Vincliuling av roller vengaged with saidcani lever on the opposite side from said irst-ii'ientioned roller.

Y 4. Y In a device of the character described for use with harrows, arunner, a. curved carin lever pivoted to 'said'runnen an operating leverpivotedV to saidA riuiner and having a rollerengagedwitli said cam leveron one side thereof and al standard arranged upon them-HOW @11d having arO1ler-i1eaeMlvith said cam lever on the opposite side fromV i* saidfirst-mentioned roller.

5. In a device of the character; described 'for use with harrows,arunner, a cam lever connected to said runner', an operating leverconnected to said runner and havinga roller engaged withV the cam leverand an abutment for said cam lever arranged upon the har-I row,andspring means for biasing said operating lever. 1 Y A 6. In a deviceof the character described for use with harrows, a runner, a cani leverconnected to said runnen-an operating lever connected to said runner andhaving a roller engaged with said cam lever and an abutment fer saidVcain lever arranged upon the Y harrow. N ,f .Y

7 In a device of the characterv described for use' with harrews, arunner, cooperabile levers pivoted to said runner, and an abutmentarranged upon the harroW and engaged with, one of saidleversu Y. Y

FRANK GRANVILLE iccERslrAFr. Y

